package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
         String token=request.getHeader("authorization");
        //2,获取redis中的用户
         if(StrUtil.isBlank(token)){
             return true;
         }
        Map<Object,Object> userMap=stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY+token);
        //3，判断用户是否存在


        if(userMap.isEmpty()) {
            //如果不存在，拦截，返回401状态码
            return true;
        }
        //将查询到的hash数据转为UserDTO对象
       UserDTO userDtO= BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);
        //存在，保存用户信息到threadlocal
        UserHolder.saveUser( userDtO);
        //刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token,30, TimeUnit.MINUTES);


        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
         UserHolder.removeUser();//删除用户，避免内存泄漏
    }

}
